Steam-boiler.



PATENTED SEPT; 25, 1906,

0. H. SMITH.

STEAM BOILER.

APPLICATION FILED 1113.19, 1906.

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.PATENTED SEPT. 25, 1906.

C. H. SMTH.

STEAM BOILER.

APPLICATION FAILED PEB.19, 1906.

2 SHEETS-SHEET INVENTUR Mmm/anwb MMX WWNEESEE iia M Mm UNITED sTATEsPATENT OFFICE.

POWER DEVELOPMENT COMPANY,

RATION OF- MAINE.

OF PORTLAND, MAINE, A CORPO- STEAM-BOILER.

Specification of Letters Patent.

Patented Sept. 25, 1906.

Application filed February 19, 1906. Serial No. 301,717.

To all whom it may concern:

Be it known that I, CLARENCE HILL SMITH, of Falmouth, in the county ofBarnstable and State of Massachusetts, have invented certain new anduseful Improvements in Steam-Boilers and I hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming part of thisspecification.

This invention has reference to improvements in steam-boilers, andparticularly to water-tube steam-boilers.

One object of the invention is to so construct a water-tube steam-boilerthat'provision for increased water circulation is furnished withoutincrease in height of the boiler.

Another object of the invention is to improve the construction ofwater-tube steamboilers having a lower rear drum with respect to thecirculation of water from said drum.

Another object of the invention is to more completely utilize theproducts of combustion.

Another object of the invention is to more fully protect thewater-circulating elements from the direct heat of the fire-box.

The invention consists in the peculiar arrangement of thewater-circulating sections or elements.

The invention also consists in the peculiar system of directing theflowv of the products of combustion.

The invention also consists in such other novel features of constructionand combination of parts as shall hereinafter be more fully described,and pointed out in the claims.

Figure l represents a side elevation of the improved boiler, partly insection. Fig. 2 represents a plan view of the sametaken on line2 2, Fig.1.

Similar numbers of reference designate corresponding parts throughout.

As shown in the drawings in its preferred form, 5 represents the grateof a steam-boiler, 6 the front wall thereof, and 7 the top, the rearwall being of any well-known construction.

At the upper front is the transversedrum 8, and at the rear is locatedthe transverse drum 9, these drums being connected by tubes 10 and 11.From the drum 9 extends a series of depending and inwardly-inclinedtubes 12, .which are connected with inclined headers 13, from whichextend forward the upwardly-inclined tubes 14, having their forward endsconnected in the drum 8. The lower ends of the headers 13 are connectedwith similar inclined headers 1 5, which in turn are connected with therear lower transverse drum 16 by short tubes 17 The headers 15 areconnnected with the similarly -inclined headers 18 by the tubes 19,these headers 18 being connected with the drum 8 by the short tubes 20.In line with the headers 18 and connected therewith is a series ofheaders 21, which are connected by the series of tubes 22` with the rearlower drum 16. From the end portions of the rear lower drum 16 extendsforward at each side of the fire-box a series of tubes 23 23, whichcommunicate at their forward ends with the headers 24 24, these headersbeing connected by the bent tubes 25 25 with the end headers of theseries 21, by means of which connection water circulating forward fromthe drum 18 through the tubes 23, may pass through the headers 24 24andthe tubes 25 25 to the headers 21.

At the sides of the fire-box 5 are located the baffles 26 26, whichprotect the tubes 23 and their headers from the direct action of theheat. At the rear these baflies 26 26 are connected by the bridge-block27, having the upwardly-extending deflector 28 for the protection of therear drum 16 from the direct action of the heat.

Between the series of tubes 19 and 22 is located the inclined baflie 29,which directs the products of combustion passing from the firebox towardthe rear of the boiler. When these products of combustion pass the endofthis baffle 29, said gases circulate upward between the tubes 19 untilthey reach the baffle 30, located between the tubes 19 and 14, and areby this baflie directed forward. The gases then pass over the forwardedge of this baffle 30 and rise between the tubes 14 and 11 until theyreach the baffle 3 1 located between the tubes l0 and 11, and aredirected toward the rear, in which passage they are directed downwardlyby the inclined deector 32 which extends from the rear end of thebafl'le 31, and again circulate between the tubes 14 and finally passout of the boiler through any suitable opening.

The transverse drums are preferably supplied with the usual inlets andoutlets, as is well known in general practice inl the constructionA ofboilers of this class.

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Water, preferably supplied to the drum 9, fills the several drums andthe circulatingtubes to a suitable height, and when its temperature israised by the heat from the gases passing from the fire-box circulatesupwardly in the several series of inclined tubes toward the front of theboiler, -the water from the tubes 14 passing directly into the drum 8,while the water circulating;` forward from the series of tubes 19 and 22passes through the headers 18 and 21, respectively, before entering saiddrum 8, the heated water and steam passing from this drum 8 to the drum9 through the tubes 1() and11. As the water circulates downward from thedrum 9 through the tubes 12 tothe headers 13 and 15 there is a naturaltendency for it to circulate Jforward again through the tubes 14 and 19,and a large portion of the water passing through these headers 13 and 15and entering the drum 16 circulates forward through the tubes 22 to theheaders21 3 but to supply additional circulation forthe water from thedrum l prefer to use the side circulation tubes 23 23, through whichwater from the drum 16 circulates forward at the sides of the fire-boxand enters the headers 21 21 through the headers 24 24 and the curvedtubes 25 25, thereby considerably increasing the circulation from thedrum 16.

By the inclination of the headers 13, 15, 2O

' and 21 tubes of approximately they same length may be used, thesetubes and their headers comprising a series of tubular sections closelyarranged, whereby a large number of circulating elements are suppliedwithout materially increasing the height of the boiler.

While I have herein shown and described a specific arrangement ofwater-circulating elements, I do not intend thereby to limit myinvention as regards said circulating elements or as regards the methodof directing the flow of the products of combustion by means of thevarious baiiies.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent- 1. A water-tube boiler comprising upper front andrear drums, tubes connecting said drums, a header below the rear drumand connected therewith, inclined tubes connecting said header with thefront drum, a rear lower drum, headers connected respectively with thefront upper drum and with the rear lower drum, the rear header of saidpair communicating with the first-mentioned header, tubes connectingsaid pair of headers, inclined tubes extending forward from the lowerdrum, a front header in which said latter tubes are connected, and aconnection between the front headers.

2. A water-tube boiler comprising upper front and rear drums, tubesconnecting the same, a rear lower drum a header below the rear upperdrum and connected therewith, tubes connecting said header and the frontdrum, intermediate headers connected respectively with the front drumand with the rear lower drum, the rear header of said pair communicatingwith the upper rear header, tubes connecting said intermediate headers,a front lower header communicating with the front intermediate header,tubes connecting said front lower header with the rear lower drum, tubesextending forward from the lower drum at the sides of the fireebox, aheader in which the forward ends of said tubes are connected; andconnections between the last-mentioned header and the front lowerheader, substantially as and for the purpose described.

3. Awater-tube boiler comprising a .front upper drum and a rear lowerdrum, a series of inclined tubes communicating with each of said drumsand extending vin opposite directions, headers in which the ends of saidtubes are connected, a series of inclined tubes, located between saiddrum-connected tubes, and furnished with he aders connected respectivelywith said drums and with the corresponding headers of the rst-mentionedseries of tubes.

4. A water-tube boiler comprising an upper front drum and a rear lowerdrum, a series of tubes extending forward from the lower drum at eachside of the fire-box, headers with which the forward ends of said tubescommunicate and connections between said headers and the front drum. 4

5. A water-tube boiler comprising an upper front drum and a lower reardrum, a series of tubes extending forward from the latter drum above thefire-box, headers in which the forward ends of said tubes are connected,connections between said headers and the front drum, and means connectedwith said headers and the rear drum for circulating water at the sidesof the fire-box.

6. A water-tube boiler comprising a firebox, baffles located at thesides of the 'firebox, a drum located at the rear of the firee box,tubes extending forward from said drum over the fire-box and furnishedat theiry forward ends with headers, a baffle located above said tubesand extending in line there-i with, a series of tubes extending forwardfrom said drum outside the side baffles of the fire-box and havingheaders connected with the front headers of the first-mentioned seriesof tubes, and a series of water-circulating elements located above thebaffie of the first series of tubes and connected with the headersthereof and with said drum.

1n testimony whereof 1 affix my signature in presence of two witnesses.

- CLARENCE HILL SMITH.

Vitnesses:

HENRY J. MILLER, Primus TONER.

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